lightfast

[ lahyt-fast, -fahst ]

adjective

not affected or faded by light, especially sunlight; colorfast when exposed to light.

Origin of lightfast

First recorded in 1955–60; light¹ + fast¹

Other words from lightfast

lightfastness, noun

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

How to use lightfast in a sentence

He harnessed four horses, who could quickly traverse the plain, and entered his light fast carriage.
A history of China., [3d ed. rev. and enl.] | Wolfram Eberhard
It was growing light fast now, and they strained their eyes for a sail.
The Rival Campers | Ruel Perley Smith
Their light fast mobile units scoot right on past the heavily fortified centers and capture small positions in the rear.
Dave Dawson at Dunkirk | Robert Sydney Bowen
"It is getting light fast," Dick said, as he wiped the perspiration from his face.
The Tiger of Mysore | G. A. Henty
It was growing light fast, and it was time they were on their way.
Battling the Clouds | Captain Frank Cobb

British Dictionary definitions for light-fast

light-fast

adjective

(of a dye or dyed article) unaffected by light

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

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